Increased difficulty and complications of delayed laparoscopic cholecystectomy following percutaneous transhepatic gallbladder drainage in acute cholecystitis: a retrospective study

Table 3 Surgical outcome comparisons between the PTGBD and no-PTGBD groups (1)

Variables	No-PTGBD group (n = 86)		PTGBD group (n = 27)		Z	P-value
Variables	Median	Mean rank	Median	Mean rank	Z	P-value
Postoperative hospital stay (d)	2	50.49	3	77.74	-3.865	0.000^*
Operation time (min)	46	45.78	98	92.74	-6.499	0.000^*
Blood loss (mL)	20	51.70	50	73.87	-3.202	0.001^*
Difficulty score	2	48.09	4	85.37	-5.336	0.000^*

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